NPIdb.org is the best NPI lookup service I have found. There are several other sites that does the same thing but NPIdb is the most easiest to use and I trust that what I find is accurate and up to date. The others look almost amature-ish and searching is so difficult.See positive reviews
NPI Number Lookup from CMS - Search the NPI Registry by name or NPI number. NPI lookup for doctors and other healthcare providers from the NPI Registry.
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